Frequency limit for Automatic Frequency Control to prevent the controller from walking too far.

Defaults to a maximum of 3kHz, but can be set to as high as 15 kHz.

src/controller/channel/ProcessingChain.java

@@ -376,7 +376,11 @@ public class ProcessingChain implements Listener<Message>
 					{
 						TunerChannelSource tcs = (TunerChannelSource)mSource;
 						
-						mAFC = new AutomaticFrequencyControl( tcs );
+						int maximumCorrection = mChannel
+							.getDecodeConfiguration().getAFCMaximumCorrection();
+						
+						mAFC = new AutomaticFrequencyControl( tcs, 
+											maximumCorrection );
 
 						/* Register AFC to receive frequency change events */
 						tcs.addListener( mAFC );

src/decode/DecodeEditor.java

@@ -21,6 +21,13 @@ import java.awt.event.ActionEvent;
 import java.awt.event.ActionListener;
 
 import javax.swing.JCheckBox;
+import javax.swing.JLabel;
+import javax.swing.JSpinner;
+import javax.swing.SpinnerModel;
+import javax.swing.SpinnerNumberModel;
+import javax.swing.SwingConstants;
+import javax.swing.event.ChangeEvent;
+import javax.swing.event.ChangeListener;
 
 import controller.Editor;
 import decode.config.DecodeConfiguration;
@@ -32,6 +39,7 @@ public class DecodeEditor extends Editor
     protected DecodeConfiguration mConfig;
     
     protected JCheckBox mAFC;
+    protected JSpinner mAFCMaximumCorrection;
 
 	public DecodeEditor( DecodeConfiguration config )
 	{
@@ -49,8 +57,42 @@ public class DecodeEditor extends Editor
 	                mConfig.setAFC( mAFC.isSelected() );                
 	            }
 	        } );
+	        
+	        mAFC.setToolTipText( "AFC automatically adjusts the center "
+        		+ "frequency of the channel to correct/compensate for "
+        		+ "inaccuracies and frequency drift in the tuner" );
 
-	        add( mAFC, "wrap" );
+	        add( mAFC, "span" );
+	        
+	        int initial = mConfig.getAFCMaximumCorrection();
+	        
+	        SpinnerModel model = new SpinnerNumberModel( initial, 0, 15000, 1 );
+
+	        mAFCMaximumCorrection = new JSpinner( model );
+
+	        JSpinner.NumberEditor editor = 
+	        		(JSpinner.NumberEditor)mAFCMaximumCorrection.getEditor();  
+	        editor.getTextField().setHorizontalAlignment( SwingConstants.CENTER );
+	        
+	        mAFCMaximumCorrection.setToolTipText( "Sets the maximum frequency "
+	        		+ "correction value in hertz, 0 - 15kHz" );
+
+	        mAFCMaximumCorrection.addChangeListener( new ChangeListener() 
+	        {
+				@Override
+	            public void stateChanged( ChangeEvent e )
+	            {
+					int value = ((SpinnerNumberModel)mAFCMaximumCorrection
+							.getModel()).getNumber().intValue();
+
+	                mConfig.setAFCMaximumCorrection( value );
+	                
+	                save();
+	            }
+	        } );
+	        
+	        add( mAFCMaximumCorrection );
+	        add( new JLabel( "Correction Limit Hz" ), "growx, push" );
 		}
 	}
 
@@ -62,14 +104,12 @@ public class DecodeEditor extends Editor
 	@Override
     public void save()
     {
-	    // TODO Auto-generated method stub
 	    
     }
 
 	@Override
     public void reset()
     {
-	    // TODO Auto-generated method stub
 	    
     }
 }

src/decode/config/DecodeConfiguration.java

@@ -35,6 +35,7 @@ public abstract class DecodeConfiguration extends Configuration
 {
 	private DecoderType mDecoderType = DecoderType.NBFM;
 	private boolean mAFCEnabled = true;
+	private int mAFCMaxCorrection = 3000;
 
 	public DecodeConfiguration()
 	{
@@ -67,6 +68,16 @@ public abstract class DecodeConfiguration extends Configuration
 		mAFCEnabled = enabled;
 	}
 	
+	public int getAFCMaximumCorrection()
+	{
+		return mAFCMaxCorrection;
+	}
+	
+	public void setAFCMaximumCorrection( int max )
+	{
+		mAFCMaxCorrection = max;
+	}
+	
 	public boolean supportsAFC()
 	{
 	    return true;

src/dsp/afc/AutomaticFrequencyControl.java

@@ -24,6 +24,7 @@ public class AutomaticFrequencyControl implements SimplexSampleListener,
 	private int mSkipThreshold = 4;
 	private int mErrorCorrection = 0;
 	private long mCurrentFrequency;
+	private int mMaximumCorrection;
 	private FrequencyChangeListener mListener;
 	
 	public enum Mode
@@ -31,9 +32,11 @@ public class AutomaticFrequencyControl implements SimplexSampleListener,
 		NORMAL,FAST;
 	}
 	
-	public AutomaticFrequencyControl( FrequencyChangeListener listener )
+	public AutomaticFrequencyControl( FrequencyChangeListener listener,
+									  int maximumCorrection )
 	{
 		mListener = listener;
+		mMaximumCorrection = maximumCorrection;
 	}
 	
 	public void dispose()
@@ -150,6 +153,14 @@ public class AutomaticFrequencyControl implements SimplexSampleListener,
 		if( correction != 0 )
 		{
 			mErrorCorrection -= correction;
+			
+			if( Math.abs( mErrorCorrection ) > mMaximumCorrection )
+			{
+				mErrorCorrection = ( mErrorCorrection < 0 ) ? 
+										-mMaximumCorrection : 
+										 mMaximumCorrection;
+			}
+			
 			dispatch();
 		}
 		else

src/source/tuner/TunerController.java

@@ -135,10 +135,6 @@ public abstract class TunerController implements Tunable
 				long maxLockedFrequency = mTunedChannels
 						.get( mTunedChannels.size() - 1 ).getMaxFrequency();
 
-				mLog.debug( "Tuner Controller min [" + minLockedFrequency +
-						   "] max [" + maxLockedFrequency + 
-						   "] bw [" + getBandwidth() + "]" );
-
 				//Requested channel is higher than min locked frequency
 				if( minLockedFrequency <= channel.getMinFrequency() &&
 					( channel.getMaxFrequency() - minLockedFrequency ) <= getBandwidth()  )